The highest day temperature in September 2023 was 87°F. The lowest night temperature was 78°F. The average values for day and night temperatures during September were 84.1°F и 80.8°F respectivly.

The average sea surface temperature in September 2023 for Unawatuna was 86.6°F. The maximum and minimum values were 85.2°F and 88.0°F respectively.

Most of the days in September are cloudy but you can also expect sunny or gloomy days.

Precipitation total in September for Unawatuna is 13.2 in. It makes september the most rainy month of the year.

The average wind speed in September is 10.8 mph. It makes September one of the most windy months of the year for Unawatuna.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Unawatuna in September is 5.4 hours.